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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b410982c3804b5a385559e1f03bf253393015b768f17acda9377749e2ea1e850' 
  AND token = 'teAkNzewcFvE4viV8wA514Fr3gNdP7XpucPa75K8/lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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