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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4478954050e698be7036fbd81fa28bc97647b481fc32534f4d034498158f643a' 
  AND token = 'RLiTejYZtK+NmogKEu0jj6QK0yviETXsfNeOkFRpJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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