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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7b042441ed412e46f2b99ca8dd13d9cacfc2a78ed0f403cbfdeeee569351bf' 
  AND token = 'tGFAFiu2u2qrLB3QFT+NUydFgw+4OvaAqocT1d5o7G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}