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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d19941345df8e62dd40984ed0e7304a68f887eb3492a4a25d30160071d98be2' 
  AND token = 'gT+P1q9vzMofMkgSG8Tjx1NMmh8DIF/8E0r3mVoXcgc=' 
  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"
    }
  }
}