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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8d29e4dac218e05d7a713e593c70dbce76d81e646d8d4c2299e3f3d5ea6e43' 
  AND token = '0yxqENR8/ZHJKa0mge/SiH3WCBXSHEhZ/4Q12X42MPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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