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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914b1d08685f9a56f3b0ccd473d83104dacfef347ea49087f7a832c61d679d88' 
  AND token = 'c781+4SXfy0Cup/RP42mHSV+mCQnc1FUCsnKmZn/TZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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