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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e3157fa0fd17dbf3645931e6d4025c29b3c2077ab9ef5b115d30be936ffde6' 
  AND token = 'jya5qBi6UyKn4dKZQVlT3IsY+BTf2XUVPg6X0I7nNdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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