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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1057c133fa6d7b3e6d525fddbb89d190d02847ac105b3dc2aa9aef1d1a4b9d2e' 
  AND token = 'YpzH1PcXhyBTTjK00dlDKFSl8VqXKJXKWw9dm1d9xnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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