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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5516a64e3e815085cd7bb71ea2abb0bc5834326265a3f190066f03b7647fbf62' 
  AND token = '0C+6HyXbjhYmwzzSO3akn3sV3xsPL8kkpetl4R9ckvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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