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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c37087f750801577dce338e4abae470612e3772820a4af3b2b0678986ebed3d' 
  AND token = 'h6FkWZE9wb5Fj7u6nGTswIfnle+50MVVkMDxnfIpj54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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