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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9efee3f0f624ae86d77dad2cab9af2b936f930bbf21d11e8f6491ff6a72cc6' 
  AND token = '4ztp2r30L9IpmfMQ70WvnDqxVs7Taa7FFWt29e/ItPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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