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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794c5e38cba2906b30f7f7c20d0f0d2cf6c398b10763d17ce2c11981aa9cfb3a' 
  AND token = 'loXmMcMQj5rgDZk7/1AvrtJy2+ClLaYTVPTw3cg202A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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