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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d143ce2c35b98e1d535c36f0d8dfc356637e391dd5571224430f8e1dc661ab' 
  AND token = 'pkEOSABe+ko/luASS/wm23mfWwRncCE+KeMxjTFsos0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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