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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b976f6ad7254aeff6f11873ddfbf4b14e33d0ec5bee4dd30f9acb5e310ab65fe' 
  AND token = 'auCppzERrjbz8JDmWHQkf13/i+wOeGlPsc3H0tKZemQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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