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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b624b8be10c1c210babd476446a56cf9b3077f19c272f08402ddce5f77873a83' 
  AND token = 'eNVT2rk1KvAD0iHM8ImeqQYOkW6gzdqrRqCMHJosxHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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