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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1d79ce72331a65ed5b01144c3024b9305faa400cc50293e1c51153fee53f3f' 
  AND token = 'GBK1e7n1/bE1SlC0hbVqHDVvum6T6puGr7rnUHTY+44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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