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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1fed47568b294a77bed2dd8c7b75fcc2cfbc0b6aec5f09cbdfad5c129c6d8e' 
  AND token = 'F/WigDg2aQt+HO0Q3RGnWDH5+HEEw22QkB/n3ScBWjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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