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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0737682c908ce562089b823e180666945c72521439d1474e2e4cc78aa5bcd155' 
  AND token = 'P6bkamq8G0eqpZkx32H3IkXoHsp+paOBI0+nJul4JsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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