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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418d8e2896e9d6ec12ecd471ea22d22da375d50e82449781ae9657f5f9b20f89' 
  AND token = 'x9pCyuqWF2eq+ntHZgwLYjWP9LG5vPaCjt8kQL3al8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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