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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6c79d059a7c346d4757e61bc527beb168a3c4b0361230f7784015e03c4d137' 
  AND token = '9s8/xyK+FE+1m3xvhDgokV+n1aYig/GNB4/0CuzsG4E=' 
  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"
    }
  }
}