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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca50daa87dd9730e9b3eaa6e615d60b176f2db767e59b2b8211b09d89056785' 
  AND token = '6QkixuRoHnLITI2KD8e7iyb9n4kPJv+wX6xHpB20Gmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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