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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38249fc204734c262577e297dc03aa5bda13ffff09881d4b397c24874d6d2c93' 
  AND token = 'bnTb0X1TB9Xsci9VMhVH/8QFHVqV/EDj9UlU03W1DJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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