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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904738029aa6f55995f017aa9b410ab900c8d77c35f81b05a9ebc3d3e8df8ce7' 
  AND token = '+6DcS80+G98otwV9yXRjuNEAZtfJBKo8VhHj8f4pq5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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