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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6709ab3a58a11a985af71efd457f60b45bf4ddd63ab91c215c0b887edb76fab' 
  AND token = 'qx8D4hhfYow576sPs9RbMwm1VStESy5E1Hv+SWCJk9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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