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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ea4b5574fbeca4ca8a8613c829c6d7d9a2102cf7b7fc18d1092d4c8e156000' 
  AND token = 'n3nqcAlECV8ey2qtezSjX1tZOaCV49dxQEDxBOi5KDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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