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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7e2213d6cd144e7b90bb2ce726c2360ec42b2eed20b1fc8b6374a5fcfe002a' 
  AND token = 'VaN7gBGKmfFRBydsPpirtEjeDYB29EtB8EynHekVdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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