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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216cc26d445e506105636d2542d4e6aa18f58749fadd5bf9c56dc777a7195bd7' 
  AND token = 'Wz9ROff9R6ixvZowbRsjrJ/r0HFCvT5/crxmVDRn6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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