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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696a24bd906b881342a734ee1c13db1de578a22ecc6ea9abf836c93bfcf9f93e' 
  AND token = 'GNjH77+Sgeavxx/p4CJ524OSNAvfgbnc52QpuX4+u5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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