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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a1c69636b53c9d75a03ea0f9e48c691a8cf4d66ae4f9599b8929764ff27b01' 
  AND token = 'ic2zO/ogqsmXxXdsTp5y67Q/khse6GkDL+VjouHkS+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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