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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf5cc24e11a898d4917261351f3c967a6c2f48488adb8de37fb2b086374b6a1' 
  AND token = '5BxbWDWANzOJPbnPS9qeH6jSWzD1iQxyWDCaZDgj9Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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