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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53256634b2c5cb6f29bab35a6cf66b9ec20234a6080df3c82ba0339ddf49d839' 
  AND token = 'SebGB/X/J6AIXGhef0AlR/SGp56PBy1NX+Fft/WKBBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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