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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b942b841c93987930c16f4cfb1d978bd955ad08c1052609aece447bd26bf42' 
  AND token = 'df51r+A4ifEEEu4D/VYffaHDc58ID6GjFIVOiX/dgT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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