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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fd4899f2369d3f35304656bd2af11607a41a856dd7ed17b4a90142a37c93d8' 
  AND token = 'tuEwE93X43vZJgMaFl1ya7Uo6EgL5/4n+zahqX7ot2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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