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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafdf21378c94d37fa828600b64f981d55e1d6f9dc1e201cd7b9fc6cbd2a6ccc' 
  AND token = 'OB+nViQY47G3YAofQNgNHhEzc1ook7ak3gQiWwkIb7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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