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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9913ee706ee7adf01e25f608a52fa16c2fe386df5fbd81cf71a3f3f18b77d55e' 
  AND token = 'gwijoBRqQawPvNYt0PYP3nnxLfQTJV0rn6eC+kgfpvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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