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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721240cb97665f8c10db5ca3c132a351c3ffc6c8b3f56f82b5a2d3c2f9a25543' 
  AND token = 'rSFrXJgnUUtBe2exkmCJSAZn8mr7rfiX/4K4Rb0q4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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