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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a095379cf3edb5dbf09ad026ea06b1d22ab55be102eb29e6b1c3a36167dc2a1e' 
  AND token = 'PZg+fPJZr8qfzIveGAbCNsJ0BSSmer7GHNVZOz1rwNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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