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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1c945eb3c85b2fd2ddfc0015e75c2442d764dbd61f7977eebe76b8a93014ef' 
  AND token = 'tq1nB/SU8kzxLbfgWUNMxMoRIeGVrp72MeFk/0s2xf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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