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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcedb2e88a711cb1a5fb4b4ece5036cec0e37da2fb4e427ca16e1d5775b1606' 
  AND token = 'a2jWsSg2C6XEniN3wLmPwlLm98tEiUFHoA+fY2csnMk=' 
  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"
    }
  }
}