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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf79f38a576ded6f4d223c1f78b3b2674552da0e4b4e06d6da7cb69cbe0b271' 
  AND token = 'fiec8itQR55mR7bdL114MZ5dTHDu6IOOE6GV1sMC5h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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