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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd54ab3dbe54e008b35c49688d9dcac2ec56790152ed01fbb138bbb1ea1c4b0' 
  AND token = 'bNeBWwaRiQfg4itYVIenuu7QeXsCCq54791y6Cwz09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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