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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5567f6b6637fed168e10bae83791db8d31a2ccc51aa2b3da436326437627c5aa' 
  AND token = 'ZvAyc0ZR/A7mxdS9Jz0l8NNoShu6T538B9Kqaz0QX9Y=' 
  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"
    }
  }
}