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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa774287c5301660c76e5b4085bb1dfaa653c0dad35fbab51a2b9b9c8a9a2cc' 
  AND token = '4OwQIqnG0fqYXuBKTh7qbZaUCh9Fka32EvLQfYQ4d6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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