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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4824c20f479530d83a1c7ed18f35057412bcb7b20a1d5cb5e3ae79e2a9e723' 
  AND token = 'QQSLspyTwX5uh6YEXa4dGWk9msYdATG1dO0EnYfr1Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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