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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779b206624e99d00dd3d6328b11ae46662f48b36b5fe4b0aea0bc2d37e277eb0' 
  AND token = '2eunDLkHktTHcYy9Ic6phIIns/yZIF2dmbldZ1UkiCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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