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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d5c6f66f38ebab1fe489c3f88581318ee0e5e6d1d38b81941f1d267b52d17f' 
  AND token = '8dbdhp0rx+Jgdh32s+hM2hx7dMfMg2oi1sTv8zZm84U=' 
  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"
    }
  }
}