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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9cc95992ab7c36d2f063cc0ce9ce194e1c9d4a786784b08c49c0065a6813fb' 
  AND token = 'hFiwB46aAcGgSJQMuNkEMWnGv8+5P+dFm18Go+0zp6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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