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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0626ab8bf8884e6d6374bc22820d03fede571ae37cbcb99bf0de12c45ef611ee' 
  AND token = 'tQdUk05TB5TfFxesCAy4C6ZjYDwPFFRpnMn6py/ZYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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