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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b7149d12de22fd7340222f8a001d303beab038be3060ccbc613c7d308d6999' 
  AND token = 'RTp+RznKjKvaU5S9TvFFqkxSPbQJ3yMVbyPAIRW7BLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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