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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2c82bf413084c7562c176c81a8e35c327ceaf94820d1a027bc3f32a3677e83' 
  AND token = 'HbXdHx57XvpRbUD5UDLQr4r4WcaUuMhVW9L+QoxN3g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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