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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c2b0da013bb429cf43b77d24be2e0f5ca274effeee1114b8ff5bea9f49535d' 
  AND token = 'KzoJL3bVopDtV5JPHHWCcJ0IFBLRfM4eZyOO0kckg/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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