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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb02fe89ef4682f84e60d4bed3b145440129b78184ad6136d100731c29ec9b4c' 
  AND token = 'iVBVJ043UgXtkBHjBolRvXuXx3sJ5WhF8HG96dXeK60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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