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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5b8af08208bc07a2c28596111ec0e68e36a660a0c849679b833fd0ebcd5c37' 
  AND token = 'mzFAETQvHTh0p+AH3q+ZGRTUPHkH5u1dL58NVZuv2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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