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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b4daa20dd981f8a9a849b041e9ae724835586dc8c28117d3e74423a1a83c6b' 
  AND token = '7TJjtkbSSsy7hkdhwjvjW1QFRvYKmAPWU99SuYgngC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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