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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9bc0f52f0e0bc7a1dc9c9a8fb1f06f62bef3a586f348ce43474082372e9b23' 
  AND token = 'KxQ6ljaIF4ReXJVBl6HglNx/olFwH6lm75ibQSD/BIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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